hi to all my first post so give me time please i have an audi a4 tdi 1998 110 bhp basically it does not go over 80 mph on the motorway and struggles uphill had the diagnostics done error code 0226 which i was told is the accelerator pedal position sensor. problem is dealer wants £275 part number 028907475b i have found one with part number 028907475aj of a passat is there any difference thanks